<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>按钮</title>
</head>
<body>
  <!-- form 表单区域 -->
  <!-- action="" 发送数据的地址 -->
  <form>
    <label>账号</label><input type="text">
    <br>
    <label>密码</label><input type="password">
    <br>
    <!-- 如果省略 type 属性，功能是 提交 -->
    <button type="submit">提交</button>
    <button type="reset">重置</button>
    <button>普通按钮</button>
  </form>
</body>
</html>